/* server.h: AFS server record * * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_AFS_SERVER_H #define _LINUX_AFS_SERVER_H #include "types.h" #include "kafstimod.h" #include <rxrpc/peer.h> #include <linux/rwsem.h> extern spinlock_t afs_server_peer_lock; /*****************************************************************************/ /* * AFS server record */ struct afs_server { atomic_t usage; struct afs_cell *cell; /* cell in which server resides */ struct list_head link; /* link in cell's server list */ struct rw_semaphore sem; /* access lock */ struct afs_timer timeout; /* graveyard timeout */ struct in_addr addr; /* server address */ struct rxrpc_peer *peer; /* peer record for this server */ struct rxrpc_connection *vlserver; /* connection to the volume location service */ /* file service access */ #define AFS_SERVER_CONN_LIST_SIZE 2 struct rxrpc_connection *fs_conn[AFS_SERVER_CONN_LIST_SIZE]; /* FS connections */ unsigned fs_conn_cnt[AFS_SERVER_CONN_LIST_SIZE]; /* per conn call count */ struct list_head fs_callq; /* queue of processes waiting to make a call */ spinlock_t fs_lock; /* access lock */ int fs_state; /* 0 or reason FS currently marked dead (-errno) */ unsigned fs_rtt; /* FS round trip time */ unsigned long fs_act_jif; /* time at which last activity occurred */ unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ /* callback promise management */ struct list_head cb_promises; /* as yet unbroken promises from this server */ spinlock_t cb_lock; /* access lock */ }; extern int afs_server_lookup(struct afs_cell *cell, const struct in_addr *addr, struct afs_server **_server); #define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0) extern void afs_put_server(struct afs_server *server); extern void afs_server_do_timeout(struct afs_server *server); extern int afs_server_find_by_peer(const struct rxrpc_peer *peer, struct afs_server **_server); extern int afs_server_get_vlconn(struct afs_server *server, struct rxrpc_connection **_conn); static inline struct afs_server *afs_server_get_from_peer(struct rxrpc_peer *peer) { struct afs_server *server; spin_lock(&afs_server_peer_lock); server = peer->user; if (server) afs_get_server(server); spin_unlock(&afs_server_peer_lock); return server; } /*****************************************************************************/ /* * AFS server callslot grant record */ struct afs_server_callslot { struct list_head link; /* link in server's list */ struct task_struct *task; /* process waiting to make call */ struct rxrpc_connection *conn; /* connection to use (or NULL on error) */ short nconn; /* connection slot number (-1 on error) */ char ready; /* T when ready */ int errno; /* error number if nconn==-1 */ }; extern int afs_server_request_callslot(struct afs_server *server, struct afs_server_callslot *callslot); extern void afs_server_release_callslot(struct afs_server *server, struct afs_server_callslot *callslot); #endif /* _LINUX_AFS_SERVER_H */